The Valve,safety Relief, cataloged under National Stock Number 4820-00-653-9602, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-653-9602 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Flange Shape | RECTANGULAR WITH HOLES FIRST END |
| Flange Face Design | PLAIN FIRST END |
| Nominal Length | 3.000 INCHES FIRST END IN |
| Connection Type | FLANGE FIRST END |
| Style Designator | ANGLE |
| Bolt Hole Nominal Diameter | 0.375 INCHES FIRST END IN |
| Center to Center Nominal Distance Between Bolt Holes Along Width | 1.750 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 4 FIRST END |
| Nominal Width | 2.500 INCHES FIRST END IN |
| Center to Center Nominal Distance Between Bolt Holes Along Length | 2.250 INCHES FIRST END IN |
| Material | STEEL BODY |
| Material | STEEL SEAT |
| Material | STEEL FLOW CONTROL DEVICE |
| Valve Operation Method | AUTOMATIC |
| Nominal Thickness | 0.250 INCHES FIRST END IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 16600406 | C/1 Advisory reference — outside the item-of-supply concept Fairbanks Morse, Llc |
| 16600406 | 3/9 Design control — primary reference U.S. Government activity |
| 2490ADHAC | 5/9 Secondary reference U.S. Government activity |
| A2490ADH3 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-653-9602 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-653-9602: Flow Control Device: POPPET; Flange Shape: RECTANGULAR WITH HOLES FIRST END; Flange Face Design: PLAIN FIRST END; Nominal Length: 3.000 INCHES FIRST END IN. 17 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.